code: def test3Freqs(self):
      mags = [1, 2, 3]
      freqs = [100, 200, 300]
  
      self.assertAlmostEqualVector(
          Tristimulus()(freqs, mags), [0.1666666667, 0, 0]
      )
  
file_path: essentia/test/src/unittests/tonal/test_tristimulus.py
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestTristimulus obj's underlying member method code with example usage: obj.test3Freqs() without return types